Support member used to fasten
torsion spring assembly of a
vertical lift door to the wall above
the door opening.
(Winding Sleeve, Winding Cone)
Part that fits
into torsion spring permitting
winding and tension adjustment.
A method of fastening vertical track
to a doorjamb using a fully
adjustable continuous angle.
attached to the bottom of the door
to seal it against the floor.
The distance from
the door opening into the building
to the first obstruction at the
provided to compensate for weakened
counterbalance. (Usually extension
(Bottom Corner Bracket)
A structural support located on the
bottom section, which hold track
rollers and provide for attachment
of the lifting cables on the
fastening vertical track to a
doorjamb using jamb brackets.
A manufactured device used to secure
two pieces of cable to each other.
Size of clamp is determined by the
fitted on torsion spring shaft onto
which lifting cable is wound when
door is opened.
A safety bottom
fixture specifically designed to
prevent a door from falling in the
event of cable breakage.
extruded aluminum post/track
assembly which substitutes for door
jamb in multiple door installations
where a clear span is required. Can
be released and carried from
Flat hinge located on all
intermediate stiles to allow for
section break as door operates.
lifting cable attached to the
exterior of the door to provide
support for extra wide or heavy
Vertical members of a door section
which provide structural rigidity
and location for center hinge
sprocket or pocket wheel attached to
shaft with chain operation giving
varying mechanical advantage in
Special horizontal track with more
than one radius used in specialty
Refers to design of door mechanisms
using weights instead of springs to
counterbalance door weight.
One full opening and closing
operation of a sectional door.
Door and Access System Manufacturing
manufacturing trade association
with 5 divisions: residential &
commercial sectional doors; rolling
doors; operator & electronics;
specialty; and association division.
A static applied
load. A load without movement.
Door section width > 10' 1".
horizontal track with a pair of
tracks used to reduce the high point
of travel of the top section of a
door to permit installation in a low
Double torsion spring shaft used
when additional space is required to
accommodate counterbalance spring
A combination of
two torsion springs of different
diameters telescoped within common
which is attached to end stile of
the door sections to carry track
rollers and allows for section
breaks as a garage door operates.
prevent door operation by electric
motor under specific circumstances.
Electric motorized device to control
Stile located at
each end of a door section, which
provides for attachment of edge
hinges. These stiles carry the total
section load and should be of
superior strength to provide
Counterbalance springs, which
provide lifting power by stretching.
Generally mounted above horizontal
Keyed lock, which
can be operated on exterior of the
A metal ring or cap that is affixed
to a cable so as to form a bottom or
loop on the end of the cable.
Design of tapered vertical track and
a graduated height of edge hinges,
which assure a weather tight, fit
between door and jamb.
above the top of the door opening to
the nearest obstruction.
Special plate attached to front of
horizontal tracks for limited
which fastens to the top of the door
to seal the door along the top of
counterbalance springs with
increased cycle lift capability for
high usage doors.
An assembly made up of a piece of
track and which can be reinforced
with a piece of angle that is used
to both guide and support the door
in the horizontal position.
International Door Association
dealer/installer trade association.
A horizontal track that follows the
slope or slant of a building roof
sliding deadbolt lock operated only
from interior of the door.
Electric operator which mounts on
the wall or ceiling and directly
drives torsion spring shaft.
bracket used to fasten vertical
tracks to doorjambs.
Weather-stripping attached to
doorjambs to help seal door along
attached to door section meeting
edges to seal door between sections.
Condition where door sections lap
the door opening one inch on each
A force applied
from or toward the side.
The distance above the top of the
door opening to the centerline of
the horizontal track. This term is
often confused with the term
Term for windows
in sectional doors.
Hardware accessories to provide for
door installation with minimum
headroom conditions. Usually less
than 16" headroom.
A report of
document that describes the
composition of a material.
A report or document from the
producing mill that provides all
pertinent data relative to the
composition, structure, heat, etc.
of a given material.
dividing bar fixed or removable
between two doors. Usually designed
to carry wind load and not vertical
to provide for door installation
with standard headroom conditions.
Usually 16" to 24" of headroom.
One Piece Door
Also known as
Shin-busters. A door that operates
as one-piece, rather than a door
made of multiple sections.
Open Back Door
Hollow door with
no insulation or back.
Area of the
garage exterior where a garage door
will hang for closure.
Distance from garage floor to the
top of an opening.
left and right jambs of an opening.
A device used to control the up and
down motion of a door.
with an arm that bends around
vertical track to receive lifting
cables. Generally used with low
The area between stiles in a door
section. The "look" of a door is
considered the "panel style."
Entry person door
which is built-in to a sectional
Complete weather stripping package
for sectional doors consisting of
astragal, jamb seal and header seal.
A wheel or drum
machined in a way to receive the
individual links of a chain. Used to
transmit direct power.
Spring-activated push rods mounted
on horizontal tracks to force door
down during closing portion of door
cycle. Generally used with jackshaft
type operator or manual chain hoist
with standard lift.
A force generated
from the center of an object toward
Steel and nylon, usually with
ball-bearing wheels that allow
sections to roll freely along door
R-value is a measurement of thermal
efficiency of a garage door, or how
well the garage door insulates. The
higher the R-value, the increased
thermal efficiency of a garage
door. Be aware that manufacturer’s
R-value calculations may vary. To
compare R-value, make sure
manufacturers follow the DASMA (Door
and Access Systems Manufacturers
Association) guidelines by stating
Steel + Insulation + Steel Interior.
Individual components of a garage
door. Garage doors are made up of
multiple sections to fill the
appropriate height of a garage
A free rolling,
cylindrical, ball bearing that is
used to guide the torsion shaft,
maintain alignment, and reduce
A pulley with a ball bearing built
into it that is designed to handle a
cable and used to control the
movement of the cables employed in
door counter balance system.
Plate (End Bearing Plate)
A bracket that
attaches to the horizontal supports
and possibly the wall to provide a
bearing surface for the torsion
shaft near the ends.
Distance from each doorjamb to the
width < 10'
Hardware used to make up door
spring-cushioned bumper attached to
horizontal track to stop door at
full open position.
(Center Bearing Plate)
Plate or bracket
which is located on the wall above
door opening to receive torsion
spring assembly support brackets.
The sleeves or
cones that are used to adapt the
torsion springs to the torsion
shaft. Torsion springs usually have
two fittings or cones. One is a
stationary sleeve or spring
retainer, while the second piece is
an adjusting cone or winding sleeve.
Sleeves (Spring Retainers)
Part that fits into the end of a
torsion spring permitting the spring
to be anchored to the spring anchor
Steel gauge is
the thickness of the steel material
used in garage doors. The lower the
steel gauge number the thicker the
steel. Real steel gauge is the true
thickness of the steel material.
Nominal steel gauge is the average
thickness of the steel material used
in production due to a plus/minus
tolerance level. Real steel gauge
is the minimum gauge of steel
material used in production.
Vertical members of a door section
which provide structural rigidity
and a location for hinge attachment.
used to increase wind load
capacities of a door, as well as
reduce deflection of a door section
in the horizontal position.
An extruded aluminum post which
substitutes for doorjambs in
multiple door installations where a
clear span is required. Operated by
a hand winch or electric operator,
it swings up parallel to header.
Refers to the
graduated spacing of the vertical
track away from the jamb permitting
weather-tight closing of door
Adjustable brackets, which usually
carry track rollers, mounted on the
top corners of the top section of
the sectional door.
The shaft of a
torsion spring assembly, which
transmits lifting power of the
torsion springs to cable drums and
Counterbalance springs which provide
balancing power by winding and
unwinding through door cycle.
Channel shaped metal bars that guide
rollers on sectional garage doors.
The arc of travel or sweep of the
top section as the door is raised
from closed to open position.
operator, which mounts above the
door in the horizontal position and
lifts door by pulling, and pushing
the top section. Specifically
designed for normal headroom and low
Support stiffener used to increase
wind load capacities of a door as
well as reduce deflection of the
door sections in the horizontal
assembly on a vertical lift door.
Refers to a hardware design that
causes doors to open vertically, no
horizontal tracks required. This
hardware is normally operated with
spring counterbalance, but also
possible with weight counterbalance.
Track assembly mounted to door
opening jambs to guide and support a
sectional door in the "closed" or
The amount of force (in PSF) exerted
by the wind along the face of the
door as it stands in the opening.
Part that fits into torsion spring
permitting winding and tension